Iviillstone-driver



(Model.) P. SLADKEY.

Millstone. Driver. No. 235,033. Patented Nov. 30,1880.

UNITED STATES ATENT einen@ PAUL SLADKEY, OF MILWAUKEE, WISCONSIN.

lIVIILLSTONE-DRIVER.

SPECIFICATION forming part of Letters Patent No. 235,033, dated November30, 1880.

Application led March 8, 1880.

To all whom fit may concern:

Be it known that I, PAUL SLADKEY, of Milwaukee, in the county ofMilwaukee, and in the State of Wisconsin, have invented certain new anduseful Improvement-s in Millstone Drivers; and I do hereby declare thatthe following is a full, clear, and exact description thereof. v

My invention relates to millstone-drivers; and it consists in a deviceby which a millstone may be run true and even, so as to produce good anduniform Hour.

In the drawings, Figure l is a perspective view of my driver with itscover removed Fig. 2, a section through Fig. l, and Fig. 3 a

- detail showing one corner of the link and the jaw to which it ispivoted.

Y A A is the outside casing of my driver, the top and bottom of whichare clamped together by bolts and nuts, (see D D, Fig. 2,) and thiscasing is also perforated to receive the studs B2, which project up anddown from thejaws B. C is a link, which connects the jaws B andsurrounds the opening through which the spindle passes. Each of the jawsis recessed on its rear side to receive one ofthe lian ges C of thelink, and at one end is provided with ears B and a rounded recess, b, toreceive a corresponding lug, c, and through these are passed bolts E,which connect them together and prevent displacement by backlash. Allstrain is borne by the lugs c acting against the walls of recesses b.

It will be perceived that the jaws are pivoted to the link at pointsdiagonally opposite from each other.

(Model.)

Operation: My driver having been placed upon the spindle and in positionin the stone, the jaws will encompass the heels ofthe bail, and as thespindle revolves when one ot' the ,jaws strikes the bail on one side itwill be revolved slightly, and, acting through the link, will throw theotherjaw into a corresponding position, and thus the bail will be caughtsimultaneously onbothj sides ot' the driver and held irml y againsttrembling.

As the lugs c are alway in contact with the rounded portions b of thejaws, all strain will be taken bythemfand the pivot-boltsnecd only bestrong fenough to prevent the backlash from displacing the parts.

Iam aware that I am not the first to use a' link for communicating themotion of one set of jaws to theiopposite'set, and therefore do notclaim such, broadly.

What I do claim is- 1. The combination, in a millstone driver, of thelink having lugs c, and jaws having ears B', and rounded recess b, forlugs cto fit in, as set forth.

2. The combination, in amillstone'- driver, of the link having tlange,`Cv and lugs with Vthe jaws having ears B and recesses b, and withpivoting-bolts, as set forth.

In testimony that I claim the foregoing I have hereunto"l setvmydhandthis 1st day of March, 1880.

PAUL SLADKEY.

Witnesses:

S. S. S'roUT, E. H. BorcrUM.

